I struggled with rating this book: I don't want to give it a 4 or a 5 because the process of reading it wasn't exactly pleasant. It's dry, but it has to be, because historical reconstructions and interpretations for this period have to be presented right alongside an exposition of the massive methodological challenges that accompany such efforts, given the near total lack of contemporary literary evidence and the clear intentional biases on the part of later writers. It's light on events and heavy on trends, but again, it really has to be, given the available evidence. If you want a comprehensive snapshot of current research on Greece between the end of the Mycenaean civilization at the end of the 13th century and the Persian invasions in the early 5th -- presented in a context that forces the reader to understand why we think what we think and why we can't leap to say more than we can say -- this book is about as good as you can get.
I find myself wishing that a similar review existed for the Mycenaean civilization, even given the insufficiency of available evidence to support a satisfying story embedded within a chronological sequence of events (maybe there is - I plan to check), so I guess there was something truly impressive here (because I'm not feeling like "pre-Classical Greece? never again!").
It was ultimately a truly headachy slog to get through this book, but the author solidly convinced me -- in spite of my strong desire to get a good story -- that any alternatives for presentation would either be way too heavy on unsupported imaginative reconstruction or too full of mind-numbingly boring details to read.